The evidence continues to accumulate: Mars used to be wet. It used to have a much more active hydrological cycle. The Mars Couriosity Rover has been revealing the complex geology of Mars including the deposition of sedimentary rocks (Curious Geology: Stunning Images Reveal a Complex Mars) but we have been able to study the watery... Continue Reading →
There is much interest in determining the likelihood of future asteroid and meteorite impacts on Earth. It is very difficult to estimate the probabilities of such events but we can learn something by looking to one of our solar system neighbors - Mars. Because the surface of Mars changes so slowly new impacts there can... Continue Reading →
Everything has an origin.* Some stories of origins are relatively simple (eg. Niagara Falls)  while others are much more complex (eg. the Grand Canyon).  The study of origins is the study and reconstruction of past events. We have eyewitness accounts of some events from the past but mostly we use circumstantial evidence left behind as... Continue Reading →
Remember the meteor that exploded over Russia earlier this year? A 50 foot diameter object exploded 14 miles above the surface of the earth and created a shock wave that injured 1500 people and damaged more than 7000 buildings. Despite the drama, the lasting effects on the earth were minimal and only small pieces of the meteorite made it to the surface of the earth.
Naturalis Historia 